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By the beginning of the 19th century, copper coins were issued for 1 ⁄ 4, 1 ⁄ 2, 1, 2 and 5 kopeks, with silver 5, 10, 25 and 50 kopeks and 1 ruble and gold 5, although production of the 10 ruble coin ceased in 1806. Silver 20 kopeks were introduced in 1820, followed by copper 10 kopeks minted between 1830 and 1839, and copper 3 kopeks ...